847
FNCA52 TJSJ 040730
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO
NATIONAL WEATHER SERVICE SAN JUAN PR
330 AM AST SAT JUL 4 2026
DISCUSSION
ELEVATED FIRE WEATHER CONDITIONS ARE EXPECTED ACROSS THE SOUTHERN
COASTAL PLAINS OF PUERTO RICO THROUGH THE HOLIDAY WEEKEND. A
COMBINATION OF DRIER AIR ASSOCIATED WITH A SAHARAN AIR LAYER,
LIMITED RAINFALL, ABOVE-NORMAL TEMPERATURES, AND STRONGER EAST-
SOUTHERLY WINDS WILL PROMOTE ADDITIONAL DRYING OF FUELS. WIND
SPEEDS WILL ALSO BE SUFFICIENT TO SUPPORT THE RAPID SPREAD OF ANY
FIRES THAT DEVELOP.
WITH INCREASED OUTDOOR ACTIVITIES AND FIREWORKS EXPECTED DURING
THE 4TH OF JULY HOLIDAY WEEKEND, THE RISK OF HUMAN-CAUSED FIRE
STARTS WILL BE HIGHER THAN NORMAL. RESIDENTS AND VISITORS ARE
URGED TO USE EXTREME CAUTION WHEN HANDLING FIREWORKS OR ANY OPEN
FLAMES, PARTICULARLY NEAR DRY VEGETATION. EVEN A SMALL SPARK
COULD QUICKLY IGNITE A GRASS OR BRUSH FIRE UNDER THE PREVAILING
WEATHER CONDITIONS.
PRZ014-042000-
SOUTHEAST COASTAL PLAINS-
330 AM AST SAT JUL 4 2026
TODAY TONIGHT SUN
CLOUD COVER MCLEAR PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 20 10
TEMP (24H TREND) 90 (0) 75 (-1) 91
RH % (24H TREND) 48 (-7) 87 (-4) 46
WIND 20FT/EARLY(MPH) E 18 E 14 E 17
WIND 20FT/LATE(MPH) E 18 E 11 E 18
MIXING HGT(FT-AGL/MSL)4800 5750
TRANSPORT WND (MPH) E 21 E 22
VENT RATE (KT-FT) 86400 109250
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ015-042000-
SOUTHERN HILLS-
330 AM AST SAT JUL 4 2026
TODAY TONIGHT SUN
CLOUD COVER MCLEAR PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 10 10
TEMP (24H TREND) 88 (+3) 71 (-2) 89
RH % (24H TREND) 59 (-7) 95 (0) 58
WIND 20FT/EARLY(MPH) E 13 E 11 E 14
WIND 20FT/LATE(MPH) SE 13 E 12 E 14
MIXING HGT(FT-AGL/MSL)4940 5850
TRANSPORT WND (MPH) E 18 E 21
VENT RATE (KT-FT) 79040 105300
DISPERSION 5 5
DSI 6 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ016-042000-
NORTH COASTAL PLAINS-
330 AM AST SAT JUL 4 2026
TODAY TONIGHT SUN
CLOUD COVER PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 10 20
TEMP (24H TREND) 91 (+1) 75 (0) 91
RH % (24H TREND) 58 (-8) 94 (-1) 59
WIND 20FT/EARLY(MPH) E 14 E 12 E 16
WIND 20FT/LATE(MPH) E 17 E 11 E 20
MIXING HGT(FT-AGL/MSL)5250 5840
TRANSPORT WND (MPH) E 17 E 22
VENT RATE (KT-FT) 78750 110960
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ017-042000-
NORTHERN HILLS-
330 AM AST SAT JUL 4 2026
TODAY TONIGHT SUN
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS NONE TSTMS
CHANCE PRECIP (%) 20 0 30
TEMP (24H TREND) 90 (+2) 72 (-1) 89
RH % (24H TREND) 60 (-5) 94 (-4) 61
WIND 20FT/EARLY(MPH) E 11 E 10 E 13
WIND 20FT/LATE(MPH) E 14 E 9 E 18
MIXING HGT(FT-AGL/MSL)5580 6340
TRANSPORT WND (MPH) E 14 E 17
VENT RATE (KT-FT) 66960 95100
DISPERSION 5 5
DSI 6 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ018-042000-
WEST COAST-
330 AM AST SAT JUL 4 2026
TODAY TONIGHT SUN
CLOUD COVER PCLDY MCLEAR MCLEAR
PRECIP TYPE TSTMS NONE TSTMS
CHANCE PRECIP (%) 40 0 30
TEMP (24H TREND) 92 (+1) 74 (0) 92
RH % (24H TREND) 59 (-5) 93 (-3) 59
WIND 20FT/EARLY(MPH) E 16 E 13 E 14
WIND 20FT/LATE(MPH) E 16 E 11 E 17
MIXING HGT(FT-AGL/MSL)4690 5360
TRANSPORT WND (MPH) E 16 E 16
VENT RATE (KT-FT) 65660 75040
DISPERSION 5 5
DSI 6 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ019-042000-
EASTERN INTERIOR-
330 AM AST SAT JUL 4 2026
TODAY TONIGHT SUN
CLOUD COVER PCLDY PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 30 30
TEMP (24H TREND) 89 (+2) 73 (-1) 89
RH % (24H TREND) 59 (-7) 95 (-1) 59
WIND 20FT/EARLY(MPH) E 14 E 13 E 14
WIND 20FT/LATE(MPH) E 14 E 13 E 14
MIXING HGT(FT-AGL/MSL)5110 5880
TRANSPORT WND (MPH) SE 18 E 22
VENT RATE (KT-FT) 81760 111720
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ022-042000-
LUQUILLO MOUNTAIN RANGE-
330 AM AST SAT JUL 4 2026
TODAY TONIGHT SUN
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 30 40
TEMP (24H TREND) 85 (+4) 70 (-2) 85
RH % (24H TREND) 66 (-11) 98 (0) 67
WIND 20FT/EARLY(MPH) E 12 E 11 E 13
WIND 20FT/LATE(MPH) E 13 E 10 E 13
MIXING HGT(FT-AGL/MSL)4370 5150
TRANSPORT WND (MPH) SE 18 E 23
VENT RATE (KT-FT) 69920 103000
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ023-042000-
CENTRAL MOUNTAIN RANGE-
330 AM AST SAT JUL 4 2026
TODAY TONIGHT SUN
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE TSTMS NONE TSTMS
CHANCE PRECIP (%) 20 0 30
TEMP (24H TREND) 87 (+4) 69 (-1) 87
RH % (24H TREND) 64 (-6) 97 (-1) 62
WIND 20FT/EARLY(MPH) E 11 E 8 E 11
WIND 20FT/LATE(MPH) SE 11 E 6 E 12
MIXING HGT(FT-AGL/MSL)5650 6570
TRANSPORT WND (MPH) E 14 E 15
VENT RATE (KT-FT) 67800 85410
DISPERSION 5 5
DSI 6 2 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ024-042000-
CAYEY MOUNTAIN RANGE-
330 AM AST SAT JUL 4 2026
TODAY TONIGHT SUN
CLOUD COVER PCLDY PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 30 20
TEMP (24H TREND) 84 (+2) 71 (-1) 85
RH % (24H TREND) 68 (-5) 98 (-2) 66
WIND 20FT/EARLY(MPH) E 12 E 10 E 13
WIND 20FT/LATE(MPH) E 12 E 10 E 13
MIXING HGT(FT-AGL/MSL)4710 5590
TRANSPORT WND (MPH) E 20 E 23
VENT RATE (KT-FT) 80070 111800
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ025-042000-
VIEQUES-
330 AM AST SAT JUL 4 2026
TODAY TONIGHT SUN
CLOUD COVER PCLDY PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 30 30
TEMP (24H TREND) 89 (-1) 77 (-1) 89
RH % (24H TREND) 58 (-3) 86 (-1) 58
WIND 20FT/EARLY(MPH) E 18 E 17 E 17
WIND 20FT/LATE(MPH) E 16 E 17 E 17
MIXING HGT(FT-AGL/MSL)3840 3820
TRANSPORT WND (MPH) E 18 E 24
VENT RATE (KT-FT) 61440 80220
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ026-042000-
CULEBRA-
330 AM AST SAT JUL 4 2026
TODAY TONIGHT SUN
CLOUD COVER PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 20 20
TEMP (24H TREND) 91 (+1) 78 (-1) 91
RH % (24H TREND) 58 (-6) 89 (+1) 59
WIND 20FT/EARLY(MPH) E 18 E 18 E 17
WIND 20FT/LATE(MPH) E 16 E 17 E 16
MIXING HGT(FT-AGL/MSL)3720 3940
TRANSPORT WND (MPH) E 20 E 24
VENT RATE (KT-FT) 63240 82740
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ027-042000-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
330 AM AST SAT JUL 4 2026
TODAY TONIGHT SUN
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 10 10
TEMP (24H TREND) 92 (+2) 75 (-1) 91
RH % (24H TREND) 48 (-8) 86 (-3) 47
WIND 20FT/EARLY(MPH) E 21 E 17 E 20
WIND 20FT/LATE(MPH) SE 21 E 13 E 23
MIXING HGT(FT-AGL/MSL)4760 5680
TRANSPORT WND (MPH) E 24 E 24
VENT RATE (KT-FT) 99960 119280
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ001-042000-
SAINT THOMAS AND SAINT JOHN-
330 AM AST SAT JUL 4 2026
TODAY TONIGHT SUN
CLOUD COVER PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 10 20
TEMP (24H TREND) 87 (-1) 78 (-1) 87
RH % (24H TREND) 62 (-3) 89 (+3) 63
WIND 20FT/EARLY(MPH) E 19 E 17 E 17
WIND 20FT/LATE(MPH) E 17 E 17 E 17
MIXING HGT(FT-AGL/MSL)3720 4090
TRANSPORT WND (MPH) E 21 E 24
VENT RATE (KT-FT) 66960 85890
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ002-042000-
ST CROIX-
330 AM AST SAT JUL 4 2026
TODAY TONIGHT SUN
CLOUD COVER MCLEAR PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 20 20
TEMP (24H TREND) 89 (0) 77 (-2) 88
RH % (24H TREND) 62 (-3) 88 (+1) 63
WIND 20FT/EARLY(MPH) E 19 E 17 E 17
WIND 20FT/LATE(MPH) E 17 E 17 E 17
MIXING HGT(FT-AGL/MSL)4540 5430
TRANSPORT WND (MPH) E 22 E 24
VENT RATE (KT-FT) 86260 114030
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
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